Coated welding rod



Patented May 4, 1926.

UNITED STATES 6R0 REFEREF-IEE PATENT osrlcs.

'To H whom it may concern:

Be it known that I. HARRY R.

won, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Im rovements in Coated Welding Rods, of w 'ch the following is a speclfication.

This invention relates to improvements in coated welding rods used in metallic welding, more particularly in electric arc welding, where the rod forms one terminal of the arc and is fused or welded onto a body"l of metal, called the base metal.

T e object of my invention is to provide a rod of desired metal, having a coating which will function to enhance the fusion of the welding metal to the base metal, especially where it is necessary to weld on to a surface inclined to the orizontal or overhead.

It has been found somewhat difiicult in this class of welding to deposit the metal from these fusible electrode rods, especially when coated with an appreciable coating containing in dients such as silica, calcium carbonate an sodium silicate, used to enhance and strengthen the weld, where the surface being a plied is verticall inclined or overhead. t would appear 0111 tests and welding operations upon surfaces of the character escribed that this diificult is due to the greatly decreased rate of coo ing of the fused metal, caused by the presence of the coating.

I have discovered that an adherent, nonflowing deposit may be secured on surfaces presenting the difiiculty mentioned by utilizmg constituents in the coating of the rod which function to give the deposited metal a solidification or congealing rate comparable to that secured by the use of bare 7 metal electrodes of mild carbon steel, for

example.

I find that iron oxide or barium carbonate fimction to obtain this desired result, due to some sgysical or chemical phenomenon.

A wel g electrode or rod embodying my invention ma be constructed as a rod of steel or me such as soft iron, steel, H01! 'or sodium silicate to facilitate the arc ammmamn a aaa. masseuse.

alloys or non-ferrous metals and other alloys, which I cover or coat with a mixture containing barium carbonate or iron oxide, for example, as an ant to gomote rapldco of the metal. as some instances fin it desirable to add such materials as calcium carbonate,'silica' mani a n and protection of the trans-"" ferre metal in a well known manner. To'ao properly attach and secure the solidifyin' ngredient on the electrode surface, I fin 1t desirable to ap ly it in conjunction with a refractory bm er, such as a water solu 'i tion of tassium silicate. "is;

One orm u1a which I have found satisfactory consists (by volume) ofparts of diluted tassium or sodium silicate (about 1.2 spec gravity) to 8 arts calcium carbonate, 2 parts of iron oxi e, by 70 volume.

Another formula consists of approximatelyf I 2 parts 0 silicate-and 1 art of barium rbona y volume. p

Ifiother formula consists of- 4 parts of mdium silicate to 1 part 112;? cgmtg, and Ipaft EIc'ium carbona e, y

$013113: fszlt'hmula 8cphnsists of- 0 pa um"cateto8 artssmga flour, and 2 paid s 1ron oxide by yolume.

Another formula Wof- 4 parts sodium silicate to 1 part silica, and 1 part b um carbonate by volume.

ltllt will ttbviousbetliat telae proportions an mgredien ma van accordiug' to the conditions met with and the results desired, without varying from the spirit of the mventiom For exam 1e, other compounds of the alkaline eart metals may be substituted for barium of calcium carbonate. I also find that the specific gravity of the potassium or sodium silicate may be varied with a variation in the results obtained. The coating is applied to the rods by forming a solution of the ingredients specified, into which the rods are dipped and then allowed to dry in the penal manner.

While I have described and claimed my 1 intention with more or less particularity, I third ingredient to control the fusion int do not wish to be restricted to the inof the electrode, the sodium silicate in 10" gredients or roportions disclosed, except at least as at by volume as the volume 0 as defined in t e appended claim. the two ot er ingredients.

I What I claim 1&- In testimony whereof, I have subscribed An electrode for arc welding comprising my name.

a metal core hevin I coating containing sodium silicate, I cium carbonate and .a HARRY R. PENNINGTON. 

